Improvement in locomotives for consuming sparks



under the boiler.

UNITED GSTATES PATENT OFFICE.

F. B. LONGMIRE AND H. JONES BROOKE, OF PHILADELPHIA, PA.

IMPROVEMENT IN LOCOMOTIVES FOR CONSUMING SPARKS.

Specication forming part of Letters Patent No. 1,681, dated July 10, v1840.

MIRE and H. JONES BROOKE, of the county of Philadelphia, in the State of Pennsylvania, have invented a new and useful apparatus for preventing the annoyance to passengers on railroads from the escape of sparks from locomotive steam-engines; and we do hereby declare that the following is a full and exact description thereof.

In the apparatus which we have invented for preventing annoyance from sparks we make use, as is usual, of the escape steam for the purpose of creating a draft through the fire; but instead of extending the wastesteam pipes upward into a vertical flue, in the ordinary way, we carry said pipes downward so as to pass within a flue under the boiler.` Said flue may extend along into or below the ash-pit under the fire-box, so as to cause the sparks, with the waste steam and the gaseous products of combustion, to be discharged into a compartment prepared therefor, or into the ash-pit, allowing their nal exit to be downward onto or toward the ground.

In the accompanying.;` drawings, Figure 1 represents so much of a locomotive steam-cngine as is necessary for the explanation of our invention. A is the body of the boiler; B, the fire-box; C, the smokebox, and D one of the steam-cylinders. E is a flue situated in the ordinary manner for allowing the draft from the fire to pass through it when the locomotive is at rest, but furnished with a throttle or other valve to close it perfectly when the engine is in action. F F are two flues leadfrom the smoke-box and uniting in a due, G, Through the two lues F F the escape-steam pipes f f (shown in dotted lines in Fig. l) pass from the respective cylinders and extend into the flue Gr, which now takes the place and performs the office of the orninary iiue E. The ilue G, as represented in the drawings, opens into a space at the lower end of the tire-box B, the bottom of which is composed of wire-gauze, the meshes of which need not be ne, as the smaller sparks which may escape through it will be projected downward and produce no injury.

The escape steam pipes must extend into the due G to a point beyond all the curvatures leading thereto. For the purpose of economizing heat we in general construct a metallic water-box or chamber, made at, inclosed on all sides, and of lsuch size as to Occupy the area of the re-box, and this, by means. of suitable tubes, we connect with the water-tank, so as to allow water to flow into it.; and we also connect with it the tubes of the supply-pumps, so that the water flowing in from the tank on one side, and heated to a considerable extent by the heat from the ash-pit and from the escape steam on its passage to the opposite side, may go to supply the boiler.

Fig. 2 is a vertical and longitudinal section through the apparatus, like parts being lettered as in Fig. 1. a is the space into which the draft through G' is represented as passing. bis the bottom of wire-gauze; c c, the water-box, into which water may ow from a tank through an opening or openin gs, as at d, and from which it may be drawn bythe supplypump through openings, as at d. We make an opening through the middle of the -waterbox cc-say from six inches to a foot (more or less) in diameter, as at e-through which aportion of the heated air may pass up into the ash-pit and aid in urging the fire. Instead of carrying the pipe G into the space under the water-box, as represented, we intend sometimes to allow it to open into the ash pit, so that the sparks and heated air may be projected into that compartment, a portion of which, such as it may be found useful so `to employ, may be allowed to pass upward through the fire and the remainder downward through the opening e in the water-box, a result which may be governed by the size of the latter, to be determined by experience. When we blow into the ash-pit in this way, the pipe or ue G is not to fill the capacity of its mouth, but a space is to bc left around it for the admission of the necessary supply of atmospheric air.

Having thus fully set forth the nature of our invention, and shown the manner in which the same is to operate, what we claim therein, and' desire to secure by Letters Patent, is-

l. The extending ofthe exhaust-steam pipes a Water-box, constructed in the way-.and elndownward and into a line passing horizonployed for the pirpose herein described. tally along under the boiler into a eompart- FRANCIS P. LONGMIRE. ment in the lower end of the fire-box, which compartment may consist of the ash-pit, or H' JONES BROOKE' of one specially prepared for the purpose, Titnesses: substantially in the manner set forth. JAMEs SANDERS,

2. The manner set forth of locating and using` J AMES MAGINNIS. 

